[Bug 9113] Ubuntu freezes on PowerBook

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------- Additional Comments From hollis at penguinppc.org  2005-07-17 06:46 UTC -------
I can confirm this problem: sporadic hangs on a 17" PowerBook. This is
first-generation, i.e. the 1GHz model. Problem was easily reproducible by doing
a default install, then attempting to install the security updates via the Gnome
panel applet.

The text console showed nothing when the hang occured. I tried to debug a little
further:
- disabling DRI in xorg.conf still hung
- sitting at framebuffer console while update is running still hung
- booting with video=offb still hung
... so I do not think it's video-related
- disabling DMA to the disk still hung

Trying to reproduce the problem in other ways:
- disk stress alone (dd if=/dev/hda of=/dev/null) did not display the problem
- network stress alone (ping flood, loop of small web page loads) did not
display the problem

The system has even hung just sitting idle at the login screen, before I've used
it after boot.

I did not see the problem when booted from the Live CD, which is odd because I
expect it's the exact same kernel (please confirm?). That could point the finger
to an interaction with some init.d service which isn't started from the Live CD.

BenH said something about clock changes that went in to mainline recently, and
suggested trying a current kernel (he may have been referring to cpufreq
changes; I will check). Sure enough, I cannot reproduce the problem with a stock
kernel.org 2.6.12.3 kernel (built with PPC defconfig). In 2.6.12.3, the system
boots at 1GHz; I think it may have booted at 667MHz in the stock Ubuntu kernel.

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